🚀 SpaceGrade 2Reading: grades 1-2MultiplicationPlace valueAdditionSubtractionMissing addends
The Moon Base Mystery
A sneaky Space Bandit snuck into Moon Base Alpha and took the chief scientist's moon map! Help the Astro Crew solve the clues and catch the villain.
Suspects
Possible suspects
Cross off a row as each clue rules it out. On screen, tap a row.
21 of 21 still in play
| Name | Gadget | Suit Upgrade | Glove Hand | Helmet Color | Distraction |
|---|---|---|---|---|---|
| Mark | Laser Cutter | Radio Jammer | Right Handed | Gold Helmet | Flashlight |
| Ellen | Stun Ray | Radar Scope | Left Handed | Blue Helmet | Flashlight |
| Mae | Jet Pack | Radio Jammer | Right Handed | Gold Helmet | Flashlight |
| Chris | Jet Pack | Solar Shield | Right Handed | Blue Helmet | Magnet Wand |
| Joan | Gravity Boots | Radio Jammer | Right Handed | Gold Helmet | Magnet Wand |
| Neil | Laser Cutter | Turbo Thruster | Right Handed | Red Helmet | Flashlight |
| Guion | Jet Pack | Solar Shield | Left Handed | Red Helmet | Magnet Wand |
| Alan | Stun Ray | Solar Shield | Left Handed | Blue Helmet | Magnet Wand |
| Samantha | Net Blaster | Moon Glider | Left Handed | Gold Helmet | Flashlight |
| Yuri | Stun Ray | Radio Jammer | Left Handed | Gold Helmet | Loud Whistle |
| Kalpana | Stun Ray | Radar Scope | Right Handed | Gold Helmet | Flashlight |
| Leland | Net Blaster | Radar Scope | Right Handed | Red Helmet | Magnet Wand |
| Victor | Stun Ray | Radio Jammer | Left Handed | Red Helmet | Loud Whistle |
| Valentina | Laser Cutter | Moon Glider | Right Handed | Red Helmet | Loud Whistle |
| Scott | Jet Pack | Radar Scope | Left Handed | Gold Helmet | Flashlight |
| Peggy | Net Blaster | Solar Shield | Right Handed | Gold Helmet | Flashlight |
| Sally | Gravity Boots | Solar Shield | Right Handed | Gold Helmet | Magnet Wand |
| Michael | Gravity Boots | Moon Glider | Right Handed | Gold Helmet | Flashlight |
| Eileen | Stun Ray | Turbo Thruster | Left Handed | Red Helmet | Loud Whistle |
| Bernard | Jet Pack | Radio Jammer | Right Handed | Red Helmet | Flashlight |
| Buzz | Stun Ray | Radar Scope | Right Handed | Gold Helmet | Loud Whistle |
Clue 1
Multiplication facts (1-12)
You count equal rows of solar trays on the moon base roof to find a clue code.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
9
132
20
42
120
100
100
1
120
77
55
44
20
2
77
44
T
9
32
2
20
1
54
44
44
77
49
100
120
55
20
18
9 × 1 =T
9 × 6 =M
11 × 12 =H
5 × 11 =D
4 × 8 =U
7 × 7 =G
6 × 3 =R
11 × 7 =N
1 × 1 =A
4 × 11 =O
7 × 6 =V
4 × 5 =E
1 × 2 =S
10 × 10 =L
12 × 10 =I
0/15 letters found
Clue 2
Place value
A computer screen shows digits in the tens and ones place with a locked message.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
26
91
15
20
60
13
13
83
60
32
47
61
15
45
T
26
91
15
60
18
18
60
25
91
T
26
91
83
32
45
What number has 2 tens and 6 ones?T
What number has 4 tens and 7 ones?U
What number has 2 tens and 0 ones?V
What number has 1 ten and 3 ones?L
What number has 1 ten and 5 ones?E
What number has 6 tens and 0 ones?I
What number has 4 tens and 5 ones?D
What number has 6 tens and 1 one?S
What number has 3 tens and 2 ones?N
What number has 9 tens and 1 one?H
What number has 1 ten and 8 ones?R
What number has 8 tens and 3 ones?A
What number has 2 tens and 5 ones?G
0/13 letters found
Clue 3
Addition
You put together two boxes of space rocks to unlock the station log.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
37
97
59
A
37
25
98
59
44
96
98
71
64
A
37
73
39
71
98
39
22
44
59
59
A
37
44
69
26
62
69
18 + 19 =A
36 + 23 =L
16 + 6 =V
47 + 24 =T
35 + 63 =H
38 + 26 =M
39 + 58 =F
26 + 43 =N
9 + 17 =R
24 + 20 =I
49 + 24 =D
59 + 37 =G
10 + 15 =S
33 + 29 =U
17 + 22 =E
0/15 letters found
Clue 4
Subtraction
You check how many energy bars are left in the storage room.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
39
74
43
17
60
12
45
17
59
45
24
82
A
39
11
11
45
45
51
A
39
24
24
12
45
11
20
45
51
45
53 - 14 =A
43 - 31 =H
97 - 23 =G
82 - 37 =E
67 - 16 =N
56 - 36 =C
47 - 4 =O
15 - 4 =S
72 - 13 =M
65 - 5 =D
47 - 23 =T
55 - 38 =L
85 - 3 =W
0/13 letters found
Clue 5
Missing addends — the last clue
You calculate how much more fuel is needed to power up the scanner.
First solve each problem. Then find each answer in the list below and cross that sentence out. One sentence will be left — that's exactly what the villain did!
Step 1 — solve these
10 + ___ = 19
2 + ___ = 10
4 + ___ = 11
8 + ___ = 12
5 + ___ = 16
8 + ___ = 11
8 + ___ = 10
8 + ___ = 18
9 + ___ = 21
3 + ___ = 9
8 + ___ = 9
Step 2 — cross out the sentence with each answer
1.The villain zoomed high up using a jet pack, then drifted off using a moon glider.
2.The villain zapped the alarm with a stun ray, then drifted off using a moon glider.
3.The villain shot a trap using a net blaster, then drifted off using a moon glider.
4.The villain stomped around in gravity boots, then blocked the lights with a solar shield.
5.The villain sliced open the lock with a laser cutter, then blocked radio signals with a radio jammer.
6.The villain zapped the alarm with a stun ray, then sped away using a turbo thruster.
7.The villain shot a trap using a net blaster, then blocked the lights with a solar shield.
8.The villain zoomed high up using a jet pack, then blocked radio signals with a radio jammer.
9.The villain zapped the alarm with a stun ray, then scanned the hallway with a radar scope.
10.The villain sliced open the lock with a laser cutter, then scanned the hallway with a radar scope.
11.The villain sliced open the lock with a laser cutter, then blocked the lights with a solar shield.
12.The villain stomped around in gravity boots, then sped away using a turbo thruster.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Moon Base Mystery
Culprit: Mark (Laser Cutter · Radio Jammer · Right Handed · Gold Helmet · Flashlight)
- Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT USE A MOON GLIDER"9 × 1 = 9 (T) · 9 × 6 = 54 (M) · 11 × 12 = 132 (H) · 5 × 11 = 55 (D) · 4 × 8 = 32 (U) · 7 × 7 = 49 (G) · 6 × 3 = 18 (R) · 11 × 7 = 77 (N) · 1 × 1 = 1 (A) · 4 × 11 = 44 (O) · 7 × 6 = 42 (V) · 4 × 5 = 20 (E) · 1 × 2 = 2 (S) · 10 × 10 = 100 (L) · 12 × 10 = 120 (I)
- Clue 2 (Place value): "THE VILLAIN USED THEIR RIGHT HAND"What number has 2 tens and 6 ones? = 26 (T) · What number has 4 tens and 7 ones? = 47 (U) · What number has 2 tens and 0 ones? = 20 (V) · What number has 1 ten and 3 ones? = 13 (L) · What number has 1 ten and 5 ones? = 15 (E) · What number has 6 tens and 0 ones? = 60 (I) · What number has 4 tens and 5 ones? = 45 (D) · What number has 6 tens and 1 one? = 61 (S) · What number has 3 tens and 2 ones? = 32 (N) · What number has 9 tens and 1 one? = 91 (H) · What number has 1 ten and 8 ones? = 18 (R) · What number has 8 tens and 3 ones? = 83 (A) · What number has 2 tens and 5 ones? = 25 (G)
- Clue 3 (Addition): "A FLASHLIGHT MADE THE VILLAIN RUN"18 + 19 = 37 (A) · 36 + 23 = 59 (L) · 16 + 6 = 22 (V) · 47 + 24 = 71 (T) · 35 + 63 = 98 (H) · 38 + 26 = 64 (M) · 39 + 58 = 97 (F) · 26 + 43 = 69 (N) · 9 + 17 = 26 (R) · 24 + 20 = 44 (I) · 49 + 24 = 73 (D) · 59 + 37 = 96 (G) · 10 + 15 = 25 (S) · 33 + 29 = 62 (U) · 17 + 22 = 39 (E)
- Clue 4 (Subtraction): "A GOLD HELMET WAS SEEN AT THE SCENE"53 - 14 = 39 (A) · 43 - 31 = 12 (H) · 97 - 23 = 74 (G) · 82 - 37 = 45 (E) · 67 - 16 = 51 (N) · 56 - 36 = 20 (C) · 47 - 4 = 43 (O) · 15 - 4 = 11 (S) · 72 - 13 = 59 (M) · 65 - 5 = 60 (D) · 47 - 23 = 24 (T) · 55 - 38 = 17 (L) · 85 - 3 = 82 (W)
- Clue 5 (Missing addends): surviving statement (box 5) → Mark10 + ___ = 19 = 9 · 2 + ___ = 10 = 8 · 4 + ___ = 11 = 7 · 8 + ___ = 12 = 4 · 5 + ___ = 16 = 11 · 8 + ___ = 11 = 3 · 8 + ___ = 10 = 2 · 8 + ___ = 18 = 10 · 9 + ___ = 21 = 12 · 3 + ___ = 9 = 6 · 8 + ___ = 9 = 1
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Multiplication, Place value, Addition, Subtraction, Missing addends
- Reading level
- grades 1-2
- Theme
- The Moon Base Mystery — set in Moon Base Alpha
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects